Relaxation of the Electret Charges of PET Films after the Action of Aerosol Particles

The electret properties of PET films before and after the action of aerosol particles (APs) are investigated. These properties are shown to depend not only on the nature and method of the polymer polarizations but also on the variations in their micro- and permolecular structure (PMS). The singularities of the differences in the processes of the relaxation of stabilized electret charges in the bulk and in the surface layers of PET films have been revealed based on the results of the analysis of the spectrum of the thermostimulated depolarization (TSD) current. The thus-obtained data on the variations in the relaxation properties of electret PET film electrets allow us to say that these films can be used for fabricating efficient aerosol catches for different purposes and aerosol-sensitive sensors operating based on the principle of decreasing the values of the electret charges.